Source : Webster's Revised Unabridged Dictionary (1913)

Aeroplane \A"["e]r*o*plane`\, n. [A["e]ro- + plane.]
   A flying machine, or a small plane for experiments on flying,
   which floats in the air only when propelled through it.

Aeroplane \A"["e]r*o*plane`\, n. [A["e]ro- + plane.]
   (A["e]ronautics)
   A light rigid plane used in a["e]rial navigation to oppose
   sudden upward or downward movement in the air, as in gliding
   machines; specif., such a plane slightly inclined and driven
   forward as a lifting device in some flying machines; hence, a
   flying machine using such a device. These machines are called
   monoplanes, biplanes, triplanes, or quadruplanes, according
   to the number of main supporting planes used in their
   constraction. Being heavier than air they depend for their
   levitation on motion imparted by one or more propellers
   actuated by a gasoline engine. They start from the ground by
   a run on small wheels or runners, and are guided by a
   steering apparatus consisting of horizontal and vertical
   movable planes. There are many varieties of form and
   construction, which in some cases are known by the names of
   their inventors.

Source : WordNet®

aeroplane
     n : an aircraft that has a fixed wing and is powered by
         propellers or jets; "the flight was delayed due to
         trouble with the airplane" [syn: {airplane}, {plane}]